Device for manufacturing molds.



E. FRIEDHEIM. DEVICE FOR MANUFACTURING MOLDS.

APPLICATION FILED 001'. 29, 1907.

906,007, Patented Dec. 8, 1908.

v \NVENTOR,

ERNEST FRHEDHEH X WITNE its. b

a Attornegs ERNEST FILIIQQHEIIVI, OF PARIS, FRANCE.

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Specification of Letters Patent.

Patented Dec. 8, 1908.

Application filed. October 29, 1907. Serial No. 399,709.

To all whom it may concern:

Be 1t known that 1, Banner FRIEDHEIM, a

subject of Great Britain, residing at Paris, France, have invented a new and useful De N108 for Manufacturing Molds Used in the Electrolytic Methods of Making so called Honeycomb Radiators, for wh'icl'i I have obtained a patent in France, No. 371,829, bearing date November 27, 1906; and I do hereby declare the'following to be a full, clear, and exact description of the same.

- The present invention has for its object a device'for manufacturing molds used in the electrolytic methods of making so-called honeycomb radiators. In producing these radiators electrolytically, a mold or core of fusible alloy is used upon which the metal, for instance, copper or the like, constituting the radiator, is deposited electrolytically.

The process of manufacture of molds in using the device established, consists in casting metal fusible at a low temperature around mandrels of suitable form placed ver'ically onp beside the other with their points of contact at their base upon a slab capable of being heated. These mandrels of any geometrical form whatever are preferably in the form of truncated pyramids of a hexagonal section and are provided at their bases with hexagonal parts from'l5 to 20 mm. in height slightly projecting beyond the body of the mandrel, which projection will constitute the space of the mold the thickness of the walls of the casting thus depending upon the projection (in practice 2/10ths to 10/10ths m.) The bottom of the mold is thus constituted by the mandrels themselves, the slab upon which they are placed simply providing a plane surface. These mandrels or pins which necessarily have the form that it is desired to give to the spaces of-the casting and consequently to the radiator to be formed, must be slightly tapered upon the part about which the fusible alloy will be cast, in order to facilitate the removal of the I casting. The prismatic part at thebase of each mandrel enables the mandrels to be rigidly and accurately secured in a true vertical position by ineans'of simple wedging' in the correct relative posicicn'in case of any tendency of the'latter being displaced.

The accompanying drawing illustrates by way of example and in elevation part of a mold constructed as hereinafter described.

a designates the mandrels of any geometrical section Whatever but slightly tapered to permit removal from the casting. b, designates their hexagonal prismatic bases. 0, the slab upon which the mandrcls are placed .and. (l the upper conical portion of each man drel.

In carrying out the process in practice the following operation is adopted :-Upon the slab, a, placed upon any heating hearth whatever andv slightly inclined as desired, a steel frame 6, is disposed, the frame having the height of the lower prismatic parts of the mandrels this frame being itself sun rounded by a false frame of plate iron, f, having a height equal to that part of the mandrels which constitutes the core for the casting the frame being pressed upon the slab, for instance, by the aid of screwed gudgcons or by bars of steel, g, furnished with clamps and rendered liquid-tight by means of a'joint of asbestos or other means. At the upper part of the false frame one or more reglets are temporarily provided to hold the above described mandrels in an absolutely vertical position when the slab, c, is horizontal. The steel frame, e, may be preferably formed from one piece of metal whereas, the false frame of sheet or plate iron, f, may be constituted by two pieces placed at right angles. It therefore suihces to place the mandrels, a, one after the other in position, the hexagonal form of their bases and the temporary inclination of the slab holding them together in place. The steel frame, 6, must be so calculated as .to contain a certain number of mandrels and so as to'permit no lateral play between them.

, ()nce all. the mandrels constituting the mold have been placed in the steel frame I as well as the steel frame which will remain adhering thereto, a cast honeycomb in fusible metal being thus obtained. The mandrel and the frame falling back into the place which they have occu ied, it is only necessary to replace the falsesheet iron or plate frame to effect a fresh castin%. The arr'angement permits of the mold eing varied as much in height as in surface sim ly .by the aid of a number of frames and false frames of different dimensions each substituted according to the number of mandrels that it is desired to employ.

I claim:

A device for the manufacture of molds for honeycomb radiators, said device comprising mandrels each having a prismatic hexagonal base cast around t e same, the juxta e fusible the sides of the'mold, locking rods which v lock said walls on the table and on the base of themandrels, and movable gages to determine the verticalposition of said walls and their distance from each other in respect of the mandrels.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing Witnesses.

ERNE ST FBIEDH'EIM.

Witnesses I J ULES FAYOLTET, EUGENE PICl-ION. 

